Seiko Cal. 6643 - 852

The 6643-852 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6643 caliber with 23j jewels beating at 36,000 bph, it delivers a 37 hours power reserve. [seikata-wm-3705757b892b]

Also known as: Sea Horse, Crown

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

36mm

Case Thickness

12.3mm

Lug Width

22mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

180m

Dial Color

Cream

Jewels

23j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1987

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